Re: access variable Q:

[jsa@organon.com (Jon S Anthony)]

In article <31C43F54.74E62073@jinx.sckans.edu> David Morton <dmorton@jinx.sckans.edu> writes:


> How do I do the following in Ada?
> 
> int *ptr;
> int i;
> 
> ptr = &i;

  i : aliased integer;

  type int_ptr is access all integer;
  ptr: int_ptr := i'access;


> I know how to do dynamic stuff with an access pointer,
> but I can't read anything clear in the RM
> about accessing a static variable...

The Rationale has a pretty nice transparent write up on this in 3.7.1.


> for instance, I have a record that I
> want to have access variables  access some of the elements:
> 
> type int_ptr is access integer;
> type foo is record
> 	a, b, c : integer;
> end record;
> 
> bar : foo;
> 
> a_ptr := ??????  -- how do I make this point at bar.a  ????

type int_ptr is access all integer; -- you need the "all"
type foo is record
    a : aliased integer; -- you need the "aliased"
    b : integer;
    c : integer;
end record;

bar : foo;

a_ptr: int_ptr := bar.a'access;


/Jon
-- 
Jon Anthony
Organon Motives, Inc.
1 Williston Road, Suite 4
Belmont, MA 02178

617.484.3383
jsa@organon.com